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Allium giganteum which is also known as Giant Onion is a perennial plant.

Allium giganteum which is also known as Giant Onion is a perennial plant that can grow up to a height of six feet tall. The bulb of this plant is edible. This plant is both a medicinal and an ornamental plant. This plant has flowers that are purple in color. The foliage is apart from the flower and the stems are long. The leaves are oval in shape and long with bright green color. The stem is long that extends from the flower to the ground with no leaves on the stem.

This plant belongs to “alliaceae” family. The flowers bloom in late spring to early summer. The plant can be eaten. The flowers turn from purple to bright purple shade as the plant grows older.

This plant has an unusual look and is used in flower and border gardens.
Alliums are members of the onion family. Among the best known Alliums are chives, onions, garlic, and shallot. This hardy, easy to grow flowering bulb comes in a wide variety of colors, heights and blooming times.

Big, multi-floriated, round blooms are produced atop of a tall, sturdy spike. In general, they bloom from late spring to early summer. Prairie onion attracts butterflies. Leaves, bulbs and bulblets can be used for food.

Early explorers ate them, and they were also used by the American settlers to treat colds, coughs, and asthma, and to repel insects. (Niering)

Growing/Caring conditions of Allium giganteum
– Ornamental Onions, or Alliums, are grown from bulbs.
– The flower head also produces seeds, but most gardeners plant the easy to handle bulbs.
– Plant Allium bulbs in the soil in the spring, as soon as the ground can be worked.
– Plant them to a depth of twice the diameter of the bulb.
– If planting Allium seeds, sow them directly into the garden.
– Plant the seeds just 1/8″ deep.
– Average Spacing 6 to 12Inches between the plants is required.
– They like full sun to partial shade.
– They tolerate poor soils, but prefer it to be well drained.
– Adding a general purpose fertilizer once in early spring is beneficial.
– Keep the soil moist to slightly dry.
– Water them during dry periods, once or twice per week.
– Keep them well weeded, or apply a 2-3 inch layer of mulch around the plants.
– Allium plants should come back yearly for many years.
– Alliums make good cut flowers. But, they will give off a slight onion scent
– Alliums have few insect or disease problems.

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